Custom post types are not showing up at all on the front end.

I am using Custom Press to create listings for a real estate site. I originally had a custom post types of "apartments" that was working fine. I created one called "listings" and it seemed to be working fine until I deleted the custom post type of apartments. Now I can see the listings on the main page but selecting the listing results in a blank page.

http://scottirealtygroup.com/
http://scottirealtygroup.com/listings/la-frontera-apartment-apt02/